MgBr 2促进ArTi(O i Pr)3的对映体选择性芳基加成到N,N'-磺酰化(1 R,2 R)-环己烷-1,2-二胺†的钛(iv)催化剂上的酮中
摘要:
据报道,MgBr 2促进了N,N'-磺酰化(1 R,2 R)-环己烷-1,2-二胺的钛催化剂催化的酮类化合物向酮中不对称地添加ArTi(O i Pr)3,结果表明:具有吸电子基团的手性N,N'-磺酰化环己烷-1,2-二胺可以有效催化不对称地将ArTi(O i Pr)3加到酮上,以高收率提供所需的叔醇,并具有良好的对映选择性。到95%ee。
A catalytic enantioselective reaction using a C-symmetric disulfonamide as a chiral ligand: Simmons-Smith cyclopropanation of allylic alcohols by the Et2Zn-CH2I2-disulfonamide system
A catalytic and enantioselective Simmons-SmithCyclopropanation of an allylic alcohol was developed by the reaction of an allylic alcohol with Et2Zn and CH2I2 in the presence of a catalytic amount of chiral disulfonamide 4.
在催化量的手性二磺酰胺4的存在下,通过烯丙基醇与Et 2 Zn和CH 2 I 2的反应,开发了烯丙基醇的催化和对映选择性席梦思-史密斯环丙烷化反应。
Catalytic enantioselective cyclopropanation with bis(halomethyl)zinc reagents. II. The effect of promoter structure on selectivity
作者:Scott E. Denmark、Beritte L. Christenson、Stephen P. O'Connor
DOI:10.1016/0040-4039(95)00259-f
日期:1995.3
The catalytic, enantioselective cyclopropanation of cinnamyl alcohol has been accomplished with bis(iodomethyl)zinc in the presence of chiral bis(sulfonamides) derived from cyclohexanediamine. An extensive survey of diamine and sulfonamide structure has revealed a marked sensitivity to the spatial relationship of the amine groups, but only a modest dependence on the sulfonamide residue.