Stereocontrol in organic synthesis using silicon-containing compounds. A formal synthesis of prostaglandins controlling the stereochemistry at C-15 using a silyl-to-hydroxy conversion following a stereochemically convergent synthesis of an allylsilane
作者:Ian Fleming、Stephen B. D. Winter
DOI:10.1039/a804276d
日期:——
and allylic displacement reactions with 1-vinylcyclohexyl acetate 20 and (Z)-1-cyclopentyloct-2-en-1-yl acetate 22. The silyl group in each of the products was converted into a hydroxy, with the removal of the 2-methylbut-2-enyl group taking place under much milder acidic conditions than those needed to remove the phenyl group from the dimethyl(phenyl)silyl group, and making this group suitable for
异戊二烯与氯(二苯基)硅烷的氢硅烷化反应得到(Z)-氯(2-甲基丁-2-烯基)二苯基硅烷7。衍生自该氯化物的铜酸盐试剂共轭添加到肉桂酸甲酯11、1,2-甲硅烷基化(十六进制) 1-炔16和丙二烯18,以及与乙酸1-乙烯基环己酯20和乙酸(Z)-1-环戊基辛-2-烯-1-基酯22的烯丙基置换反应。每个产物中的甲硅烷基均转化为羟基,在比在二甲基(苯基)甲硅烷基中除去苯基所需的条件更温和的酸性条件下,除去2-甲基丁-2-烯基,并使该基团适合于将烯丙基硅烷转化为烯丙基硅烷。烯丙醇。立体定向抗(Z)-(1 S,5 R,6 R,7 R,1 'S)-7-苯甲酰氧基-6-(1'-苯甲酰氧基辛基-2'-烯基)-2-的烯丙基苯甲酸酯基团的共轭置换杂二环[3.3.0]辛-3-酮52和立体有择合成共轭位移在氨基甲酸酯基的(ž) - (1小号,5 - [R,6 - [R,7 - [R,1' - [R)-7-苯甲酰氧基6-(1'-