Detail of "994-89-8"

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A Regio- and Stereoselective Route to (E)-Stannylenynes by Cross-Coupling of Stannyl Vinyldialkylboranes with Alkynyl(phenyl)iodonium Tosylates

A Regio- and Stereoselective Route to (E)-Stannylenynes by Cross-Coupling of Stannyl Vinyldialkylboranes with Alkynyl(phenyl)iodonium Tosylates. Yang, De-Yu; He, Jun; Miao, Sheng (Department of Chemistry, Zhejiang University (Xi-xi Campus), Hangzhou, Peop. Rep. China). Synthetic Communications, 33(15), 2695-2700 (English) 2003 Marcel Dekker, Inc. 994-89-8 and 650605-98-4 are cas registry numbers. These chemicals are also mentioned in this article. CODEN: SYNCAV. ISSN: 0039-7911. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) Section cross-reference(s): 23 In the presence of NaOMe and CuBr×SMe2, the coupling of stannylvinyldialkylboranes with alkynyl(phenyl)iodonium tosylates at -20° gives the corresponding (E)-stannylenynes in good yield. Addn. of 9-borabicyclo[3.3.1]nonane to ethynylstannanes R3SnCYCH (R = Ph, Bu, Et) gave the corresponding (E)-R3SnCH:CHBR'2 together with minor amts. of the gem-product (BR'2 = 9-borabicyclo[3.3.1]nonan-9-yl), which were converted in situ to Cu(I) derivs. by treatment with CuBr×SMe2 and coupled with iodonium tosylate [(R2CYC)I+Ph]OTs to give (E)-R3SnCH:CHCYCR2 (1a-h, R2 = Ph, tBu, iBu). The reaction is stereoselective and occurs with the retention of configuration. High regioselectivity for the formation of (E)-2-stannylvinylboranes (vs. 1-stannylvinylboranes) is obtained only if the R substituent is sufficiently bulky. .

An efficient synthesis of conjugated trienoic acids via Stille cross-coupling reaction of (E)-1,2-bis(tributylstannyl)ethylene

An efficient synthesis of conjugated trienoic acids via Stille cross-coupling reaction of (E)-1,2-bis(tributylstannyl)ethylene. Thibonnet, Jerome; Abarbri, Mohamed; Parrain, Jean Luc; Duchene, Alain (Laboratoire Physicochimie Interfaces Milieux Reactionnels, Faculte Sciences Tours, Tours F-37200, Fr.). Synlett, (7), 771-772 (English) 1997 Thieme.Some commonly used reagents like 994-89-8 is used in this experiment. CODEN: SYNLES. ISSN: 0936-5214. DOCUMENT TYPE: Journal CA Section: 23 (Aliphatic Compounds) Section cross-reference(s): 29 Stereoselective construction of conjugated trienoic acids was achieved through 2 successive Stille reactions, coupling as the first step (E)-Bu3SnCH:CHSnBu3 and tributylstannyl 3-iodoalk-2-enoates. The second step can be conducted by (1) cross-coupling of the stannyl dienoates Bu3SnCH:CHCR:CO2SnBu3 [I; R = (E,Z)-Me, (E,E)-H, (E,Z)-H] and vinyl iodides, or (2) cross-coupling of vinyltin reagents and tributylstannyl 5-iodopenta-2,4-dienoates generated by iododestannylation of stannyl dienes I. 994-89-8 is the cas registry number. This chemical is also mentioned in this article. ..