Synthesis and diels-alder reactions of (R)-4-hydroxy-4-p-tolylsulfinylmethyl-2,5-cyclohexadienone
作者:M.Carmen Carreño、Manuel Pérez González、Jean Fischer
DOI:10.1016/0040-4039(95)00879-h
日期:1995.7
Enantiomerically pure (R)-4-hydroxy-4-p-tolylsulfinylmethyl-2,5-cyclohexadienone 1 was synthesized in two steps and 80% overall yield from 4,4-dimethoxy-2,5-cyclohexadienone and (R)-methyl-p-tolyl sulfoxide. The Diels-Alder reaction of cyclopentadiene with 1 ocurred exclusively from the C-4 hydroxyl face in either thermal or catalytic conditions. From the reaction carried out in the presence of BF3·OEt2
对映体纯的(R)-4-羟基-4-对甲苯基亚磺酰基甲基-2,5-环己二烯酮1分两步合成,并且从4,4-二甲氧基-2,5-环己二烯酮和(R)-甲基的总收率达到80%-对甲苯基亚砜。环戊二烯与1的Diels-Alder反应仅在热或催化条件下发生于C-4羟基表面。从在-78℃下在BF 3 ·OEt 2存在下进行的反应中,以75%的收率分离出加合物6。