Highly enantioselective hetero-Diels–Alder reactions between Rawal’s diene and aldehydes catalyzed by chiral dirhodium(ii) carboxamidates
作者:Yudai Watanabe、Takuya Washio、Naoyuki Shimada、Masahiro Anada、Shunichi Hashimoto
DOI:10.1039/b919535a
日期:——
The first example of a chiral Lewis acid-catalyzed enantioselective hetero-Diels-Alder (HDA) reaction between 1-dimethylamino-3-silyloxy-1,3-butadiene (Rawal's diene) and aldehydes is described. The cycloaddition reaction under the influence of 1 mol% of dirhodium(II) tetrakis[N-benzene-fused-phthaloyl-(S)-piperidinonate], Rh(2)(S-BPTPI)(4), proceeded cleanly and gave, after treatment with acetyl chloride
描述了1-二甲基氨基-3-甲硅烷氧基-1,3-丁二烯(Rawal's二烯)和醛之间手性路易斯酸催化的对映选择性杂-Diels-Alder(HDA)反应的第一个例子。在1 mol%四[N-苯-稠合邻苯二甲酰-(S)-哌啶子酸酯]二铑(II),Rh(2)(S-BPTPI)(4)的影响下进行环加成反应,干净地进行纯化,得到用乙酰氯处理后,相应的二氢吡喃酮的ee最高可达99%。