142824-10-0Relevant articles and documents
1,5-Stereocontrol in tin(IV) halide mediated reactions between N- and S-substituted pent-2-enylstannanes and aldehydes or imines
Stanway, Steven J.,Thomas, Eric J.
experimental part, p. 5998 - 6009 (2012/09/08)
Following transmetalation of (4S)-4-(dibenzylamino)pent-2-enyl(tributyl) stannane with tin(IV) bromide, reactions of the resulting allyltin tribromide with aldehydes gave (3Z)-1,5-syn-5-(dibenzylamino)hex-3-en-1-ols with excellent, ca. 98:2, stereocontrol. (4R)-5-Benzylthio-4-methylpent-2-enyl(tributyl) stannane similarly reacted with aldehydes to give (3Z)-1,5-anti-6-benzylthio-5- methylhex-3-en-1-ols with 87:13 stereocontrol. Although the analogous reaction of (4R)-4-benzylthiopent-2-enyl(tributyl)stannane with benzaldehyde proceeded with some stereoselectivity, 80-90:20-10, in favour of the (3Z)-1,5-syn- diastereoisomer, the yield was low due to a competing Lewis acid catalysed 1,4-elimination. N-Acylamino- and S-acylthio-pent-2-enylstannanes reacted with aldehydes with variable syn/anti-stereoselectivities. Tin(IV) chloride promoted reactions of the 4-(dibenzylamino)pent-2-enylstannane with 1- alkoxycarbonylimines gave (E)-alk-4-enoates with a modest preference for the 2,6-anti-products, 2,6-anti/2,6-syn=75:25.
Effective 1,5-, 1,6- and 1,7-remote stereocontrol in reactions of alkoxy- and hydroxy-substituted allylstannanes with aldehydes
Carey, John S.,MacCormick, Somhairle,Stanway, Steven J.,Teerawutgulrag, Aphiwat,Thomas, Eric J.
experimental part, p. 3896 - 3919 (2011/06/26)
Alk-2-enylstannanes with 4-, 5- and 6-alkoxy- or -hydroxy-substituents are transmetallated stereoselectively with tin(iv) halides to generate allyltin trihalides which react with aldehydes to give (Z)-alk-3-enols with useful levels of 1,5-, 1,6- and 1,7-stereocontrol. Alk-2-enylstannanes with a stereogenic centre bearing a hydroxy or alkoxy group at the 4-, 5- or 6-position, react with overall (Z)-1,5-, 1,6- and 1,7-syn-stereoselectivity with respect to the hydroxy and alkoxy substituents. The analogous reactions of alkoxy- and -hydroxyalk-2-enylstannanes with a methyl bearing stereogenic centre at the 4- or 5-position react with overall (Z)-1,5- and 1,6-anti-stereoselectivity with respect to the hydroxy and methyl substituents.
Optically active phenol derivatives and preparation thereof
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, (2008/06/13)
An optically active tri-substituted methane compound having, as substituents, an aromatic ring group and a phenyl group having hydroxyl group at ortho or para position can be obtained by allowing a phenol compound unsubstituted at the ortho- or/and para-p