Charming: Prins cyclization of a bis(silyl) homoallylic alcohol with an aldehyde shows excellent cis and Z selectivity to form tetrahydropyrans containing a geometrically defined exocyclic vinylsilane. This reaction was used as the key step in the synthesis of ring B of the bryostatins.
迷人的Prins:双(甲
硅烷基)均烯丙基醇与醛的环化反应显示出优异的顺式和Z 选择性,可形成含有几何定义的环外
乙烯基硅烷的
四氢吡喃。该反应被用作bryostatins B环合成的关键步骤。