56962-83-5

Upstream product

• 1119-64-8 1-bromohexyne 
• 1568-65-6 bis(cyclohexanyl)borane 
• 693-02-7 hex-1-yne 
• 110-83-8 cyclohexene 
• 79083-22-0 hexen-1-yl-dicyclopentadienylzirconium(IV) chloride 
• 36140-19-9 dicyclohexylboron chloride 
• 87393-80-4 [(Z)-1-bromo-1-hexenyl]dicyclohexylborane 

Downstream Products

• 167611-52-1 (R)-1-phenyl-(E)-hept-2-en-1-ol 
• 16644-98-7 (E)-1-iodohexene 
• 13154-13-7 (E)-1-bromohex-1-ene 
• 16538-47-9 (Z)-1-iodohex-1-ene 
• 69322-45-8 (E)-9-(hex-1-en-1-yl)-9-borabicyclo[3.3.1]nonane 
• 32705-46-7 B-methoxydicyclohexylborane 
• 109801-00-5 (1E)-1-phenylhept-1-en-3-ol 
• 140148-19-2 (S)-1-phenyl-(E)-hept-2-en-1-ol 

Relevant academic research and scientific papers

FUNCTIONALIZED PRIMARY ALKYLTRIFLUOROBORATE SALTS AND METHOD FOR MAKING THE SAME

The invention provides methods for preparing boronic acids, for example, primary alkyl or alkenyl boronic acids, and alkali metal alkyl trifluoro borate salts, as described herein, wherein the primary alkyl boronic acids and the potassium alkyl trifluoroborate salts can contain one or more unprotected functional groups.

Poly(propylene sulfide)-borane: Convenient and versatile reagent for organic synthesis

Poly(trimethylene sulfide)-borane adduct has been used as an efficient borane reagent in hydroboration reactions to produce various organoboranes, which have then been used without isolation in further reactions that involve single, double and triple migrations of alkyl groups. The presence of the polymer causes no problems, but there are practical advantages associated with its use, including lack of odour and easy recoverability.

Transfer of alk-1-enyl group from boron to tin: A highly stereoselective synthesis of (E)-alk-1-enyltributylstannanes

Treatment of (E)-alk-1-enyldicyclohexylboranes with tributyltin methoxide in the presence of galvinoxyl (1 mol%) at room temperature results in transfer of the alk-1-enyl group from boron to tin to give (E)-alk-1- enyltributylstannanes in a highly stereoselective fashion. Subsequent halodestannylation of (E)-alk-1-enyltributylstannanes is allowed to proceed in a one-pot manner to produce the corresponding (E)-1-iodoalk-1-enes and (E)-1-bromoalk-1-enes in good to high yields, respectively. Georg Thieme Verlag Stuttgart.

Direct, stereospecific generation of (Z)-disubstituted allylic alcohols

A one-pot method to prepare highly functionalized (Z)-disubstituted allylic alcohols is introduced. Hydroboration of a variety of 1-bromo-1-acetylenes with dicyclohexyl borane, reaction with t-BuLi, and transmetalation to zinc generates a (Z)-disubstituted vinylzinc reagent. In situ reaction of this reagent with aldehydes generates (Z)-disubstituted allylic alcohols in high yields (81-97%). Addition to chiral protected α- or β-oxygenated aldehydes proceeds with diastereoselectivities between 6:1 and 18:1. The anti-Felkin product is obtained in most cases. Copyright

Enantioselective addition of vinylzinc reagents to aldehydes catalyzed by modular ligands derived from amino acids

A series of N-acylethylenediamine-based ligands were synthesized from Boc-protected amino acids. The ligands were screened for the ability to catalyze the asymmetric addition of vinylzinc reagents to aldehydes. Three sites of diversity on the ligands were optimized for this reaction using a positional scanning approach. The optimized ligand 3d was found to catalyze the formation of 15 different (E)-allylic alcohols with enantioselectivities that ranged from 52 to 91% ee and yields that ranged from 40 to 90%. This ligand was especially effective for the reaction of aromatic aldehydes with vinylzinc reagents derived from bulky terminal alkynes. Ligand 3d catalyzed the addition of (E)-(3,3-dimethylbut-1-enyl)(ethyl)zinc to 2-naphthaldehyde to give (R,E)-4,4-dimethyl-1-(naphthalene-1-yl)pent-2-en-1-ol in 89% ee. The ee of this product could be increased to 97% through a single recrystallization.

A positional scanning approach to the discovery of dipeptide-based catalysts for the enantioselective addition of vinylzinc reagents to aldehydes

A combinatorial library of dipeptide N-acylethylenediamine-based ligands was synthesized by parallel solid-phase methods. These ligands were screened in crude form as catalysts for the asymmetric addition of vinylzinc reagents to aldehydes to give chiral allylic alcohols. Three sites of diversity on the ligands were optimized using a positional scanning approach. The optimized structure from the library, ligand 54, was found to catalyze the formation of 10 different (E)-allylic alcohols with enantioselectivities ranging from 90% to 95% ee. This ligand was effective for both aromatic and α-branched aldehydes, and vinylzinc reagents derived from both bulky and straight chain terminal alkynes.

One-pot asymmetric synthesis of acyclic chiral epoxy alcohols via tandem vinylation - Epoxidation with dioxygen

(Chemical Equation Presented) We have developed a one-pot procedure for the asymmetric synthesis of a synthetically challenging class of acylic secondary epoxy alcohols with three contiguous stereocenters from simple achiral starting materials. The epoxy alcohols are synthesized via a tandem catalytic asymmetric vinylation of an aldehyde coupled with a diastereoselective epoxidation reaction. A vinylzinc reagent generated in situ undergoes enantioselective addition to an aldehyde in the presence of a zinc catalyst to provide an allylic zinc alkoxide. This species is then epoxidized by addition of dioxygen and a titanium tartrate catalyst to give epoxy alcohols with excellent enantioselectivities, in most cases, and with diastereoselectivities up to 4.5:1 in favor of the threo-diastereomer. The system described herein represents a significant advance in terms of synthetic efficiency and selectivity.

Solid-phase synthesis of chiral N-acylethylenediamines and their use as ligands for the asymmetric addition of alkylzinc and alkenylzinc reagents to aldehydes

A solid-phase procedure has been developed for the synthesis of chiral N-acylethylenediamine ligands. The ligands are obtained in good yield and purity, without the need for chromatography or other purification methods. Several new and previously reported ligands were prepared using this procedure. These compounds were examined as catalysts for the enantioselective addition of alkylzinc reagents to aldehydes. In all cases, the crude ligands from the solid-phase syntheses catalyzed the reactions with similar yields and stereoselectivities when compared to reactions using ligands that had been purified by standard methods. Preliminary studies were also performed with ligands 3a and 3f as catalysts for the addition of alkenylzinc reagents to aldehydes to give chiral allylic alcohols. Ligand 3f was found to catalyze this addition reaction in up to 76% ee.

A one-pot diastereoselective synthesis of cis-3-hexene-1,6-diols via an unusually reactive organozinc intermediate

A highly diastereoselective method for the synthesis of cis-3-hexene-1,6-diols has been developed. This new reaction proceeds with excellent control of diastereoselectivity over four stereocenters and the double bond geometry. The diols are made in a one-pot procedure involving hydroboration of a terminal alkyne and transmetalation to zinc to give a divinylzinc intermediate. This intermediate undergoes reductive elimination, forming a C=C bond. In the absence of a trapping reagent, diene is liberated (70% yield); however, in the presence of ketones or aldehydes, the proposed intermediate metallocyclopentene is trapped via a double insertion of the carbonyl substrate. Workup provides the diols in 47-86% yield. Copyright

Stereoselective synthesis of conjugated alkadienes via the palladium-catalyzed coupling reaction of (Z)-or (E)-alkenylboranes with (Z)-or (E)-2-halo-1-(alkylseleno)ethenes

The reaction of (E)-or (Z)-1-alkenyldicyclohexylboranes (1 or 2) with either (Z)-or (E)-2-halo-1-(alkylseleno)ethenes (3 or 4) in the presence of a catalytic amount of tetrakis (triphenylphosphine) palladium and sodium methoxide provides the corresponding