90481-81-5

Upstream product

• 90481-79-1 4-bromo-3-(chloromercurio)-1-tosylindole 
• 107-05-1 3-chloroprop-1-ene 
• 98-59-9 p-toluenesulfonyl chloride 
• 52488-36-5 4-bromo-1H-indole 

Downstream Products

• 1273005-83-6 2-(4-bromo-1-tosyl-1H-indol-3-yl)acetaldehyde 
• 1273006-07-7 (R)-1-(4-bromo-1-tosyl-1H-indol-3-yl)-4-[(2R,5S)-2-phenyl-3-tosyl-1,3-oxazinan-5-yl]but-3-yn-2-ol 
• 1273006-13-5 (S)-1-(4-bromo-1-tosyl-1H-indol-3-yl)-4-[(2R,5S)-2-phenyl-3-tosyl-1,3-oxazinan-5-yl]but-3-yn-2-ol 
• 90481-82-6 1-tosylbenzindoline 

Relevant academic research and scientific papers

Catalytic asymmetric formal total syntheses of (+)- and (-)-cycloclavine

We report an expeditious catalytic asymmetric approach to clavine alkaloids via a key Heck cyclization. This reaction sets the formation of vicinal stereocenters with excellent diastereoselectivity. Utilizing the aforementioned strategy, the formal total

Enantioselective total synthesis of (+)-lysergic acid, (+)-lysergol, and (+)-isolysergol by palladium-catalyzed domino cyclization of allenes bearing amino and bromoindolyl groups

Enantioselective total synthesis of the biologically important indole alkaloids (+)-lysergol, (+)-isolysergol, and (+)-lysergic acid is described. Key features of these total synthesis include (1) a facile synthesis of a chiral 1,3-amino alcohol via the Pd(0)- and In(I)-mediated reductive coupling reaction between l-serine-derived 2-ethynylaziridine and formaldehyde; (2) the Cr(II)/Ni(0)-mediated Nozaki-Hiyama-Kishi (NHK) reaction of an indole-3-acetaldehyde with iodoalkyne; and (3) Pd(0)-catalyzed domino cyclization of an allene bearing amino and bromoindolyl groups. This domino cyclization enabled direct construction of the C/D ring system of the ergot alkaloids skeleton, as well as the creation of the C5 stereogenic center with transfer of the allenic axial chirality to the central chirality.

Palladium-Catalyzed Reactions in the Synthesis of 3- and 4-Substituted Indoles. Approaches to Ergot Alkaloids

An efficient synthesis of 4-bromo-1-tosylindole (10) based on the Pd(II)-catalyzed cyclization of an o-ethenylaniline p-toluenesulfonamide has been developed.A Pd(0) oxidative addition-olefin insertion-β-hydride elimination cycle converted 10 to a number of 4-substituted 1-tosylindoles.Selective electrophilic substitutions at the 3-position of 10 provided access to the 3-(chloromercurio)- (18) and 3-iodo-1-tosylindoles (22).Transmetalation to palladium and allyl chloride insertion converted 18 to 3-allyl-4-bromo-1-tosylindole (20) which could be cyclized to the benzindoline 21.A Pd(0) oxidative addition-olefin insertion-β-hydride elimination cycle converted the 3-iodo compound 22 to a number of 4-bromo-3-substituted 1-tosylindoles including 24, a potential precursor to optically active tryptophans.