易获得的乙烯基环氧亚砜与有机铜试剂的S N 2'置换以高收率,高抗选择性和良好的E / Z立体控制度产生对映体纯的α-羟基乙烯基亚砜。在相关的甲磺酰氧基乙烯基亚砜上的第二烯丙基置换使得两个相邻的手性中心的不对称结构成为可能。另外,在炔基环氧亚砜中用铜酸盐介导的S N 2'可以良好的产率得到α-羟基烯丙基亚砜。
Synthesis and Diastereoselective Complexation of Enantiopure Sulfinyl Dienes: The Preparation of Sulfinyl Iron(0) Dienes
摘要:
The preparation of a diverse array of enantiomerically pure 1- and 2-sulfinyl dienes has been achieved via Stille coupling of halovinyl sulfoxides and vinyl stannanes, hydrogenation of 1-sulfinyl-1-en-3-ynes, or vinylcupration of 1-sulfinyl alkynes. Formation of the corresponding sulfinyl diene iron(0) tricarbonyl complexes was accomplished by utilizing Fe(CO)(5)/NMO or (bda)Fe(CO)(3) as iron(0) tricarbonyl transfer reagents. Installation of the iron(0) tricarbonyl fragment was shown to be highly diastereoselective (10-16:1) for (R)-(1Z)-1-sulfinyl dienes, most likely as a result of allylic 1,3-strain. The synthesis of a 1-sulfinyl-1,3,8,10-tetraene is also described.
Stereocontrolled synthesis of enantiomerically pure 2-dienyl sulfoxides via palladium-catalyzed coupling reactions
作者:Robert S. Paley、Heather L. Weers、Paloma Fernández、Roberto Fernández de la Pradilla、Sonia Castro
DOI:10.1016/0040-4039(95)00604-b
日期:1995.5
Enantiopure 2-sulfinyl dienes can be prepared via regio- and stereoselective hydrostannylation of alkynylsulfoxides; after conversion to the corresponding vinyliodides these substrates may be coupled with vinylstannanes via Stille methodology in the presence of BHT.