Hetero Diels−Alder Reactions of 1-Amino-3-siloxy-1,3-butadienes under Strictly Thermal Conditions
作者:Yong Huang、Viresh H. Rawal
DOI:10.1021/ol006404d
日期:2000.10.1
The hetero Diels-Alder reaction of 1-amino-3-siloxy-1,3-butadiene (1a) with a range of unactivated aldehydes proceeds readily under remarkably mild conditions: at room temperature and in the absence of Lewis acid catalysts. The cycloadducts are formed in good yields and can be converted directly to the corresponding dihydro-4-pyrones using acetyl chloride. Ketones and imines are also reactive in hetero
1-氨基-3-甲硅烷氧基-1,3-丁二烯(1a)与一定范围的未活化醛的杂Diels-Alder反应在非常温和的条件下容易进行:在室温下和不存在路易斯酸催化剂的情况下。可以以高收率形成环加合物,并且可以使用乙酰氯将其直接转化为相应的二氢-4-吡喃酮。酮和亚胺在与该二烯的杂Diels-Alder反应中也具有反应性。