Very high enantio- and diastereo-selectivesynthesis of certain aminoacids may be realized through the reaction of 9-allyl- and 9-but-2-enyl-9-borabicyclo[3.3.1]nonane with α-imino-esters.
Studies on the reaction of α-imino esters with organometallic compounds
作者:Yoshinori Yamamoto、Wataru Ito
DOI:10.1016/s0040-4020(01)86047-6
日期:1988.1
other organometallic reagents such as Mg. Al, Cu, Tl, and B derivatives reacted at the nitrogen atom. Use of the (S)-amine as a chiral auxiliary of 2 created the R chirality at the imino carbon. Very high chiral Induction was realized In the reaction of prenylzinc reagent wlih α-imino 8-(-)phenylmenthyl ester (10). The reaction of 2 with heteroatom substituted allylic organometalic compounds (15) gave
Remote asymmetric induction in reactions between 4- and 5-benzyloxypent-2-enyl(tributyl)stannanes and chiral imines prepared from butyl glyoxylate
作者:David J. Hallett、Eric J. Thomas
DOI:10.1039/c39950000657
日期:——
Transmetallation of 4- and 5-benzyloxypent-2-enyl(tributyl)stannanes 13 and 18 with tin(IV) chloride generates intermediate allyltin trichlorides which react with imines 9 and ent-9, prepared from butyl glyoxylate and either (R)- or (S)-1-phenylethylamine, with effective 1,5-asymmetric induction.
1,5-Asymmetric induction in reactions between 4- and 5-alkoxypent-2-enyl(tributyl)stannanes and achiral 1-alkoxycarbonylimines
作者:David J Hallett、Eric J Thomas
DOI:10.1016/0957-4166(95)00337-o
日期:1995.10
Tin(IV) chloride promoted reactions of 4- and 5-alkoxypent-2-enyl(tributyl)stannanes 1, 11 and 15 and 1-alkoxycarbonylimines 2 proceed with excellent 1,5-asymmetric induction.
The Effect of a tert-butyldimethylsilyl substituent on the 1,5-asymmetric induction found in reactions of 4- and 5-alkoxyallylstannanes with aldehydes and imines
作者:Gregory W Bradley、David J Hallett、Eric J Thomas
DOI:10.1016/0957-4166(95)00338-p
日期:1995.10
The 4-benzyloxy- and 4-tert-butyldimethylsilyloxy-pent-2-enylstannanes 6a and 6b show different stereoselectivity in tin(IV) chloride promoted reactions with aldehydes and imines.