Catalytic Asymmetric Spirocyclizing Diels–Alder Reactions of Enones: Stereoselective Total and Formal Syntheses of α-Chamigrene, β-Chamigrene, Laurencenone C, Colletoic Acid, and Omphalic Acid
作者:Santanu Ghosh、Johannes Eike Erchinger、Rajat Maji、Benjamin List
DOI:10.1021/jacs.2c01971
日期:2022.4.20
We disclose a general catalytic enantioselective Diels–Alder reaction of exo-enones with dienes to give spirocyclanes. The obtained products feature highly congested quaternary stereogenic spirocenters and are used in concise total and formal syntheses of several sesquiterpenes, including of α-chamigrene, β-chamigrene, laurencenone C, colletoic acid, and omphalic acid. The stereo- and regioselectivities
我们公开了外烯酮与二烯的一般催化对映选择性 Diels-Alder 反应生成螺环烷。获得的产品具有高度拥挤的四元立体螺中心,可用于几种倍半萜烯的简明全合成和正式合成,包括α-chamigrene、β-chamigrene、月桂烯酮 C、colletoic 酸和 omphalic 酸。我们的螺环化环加成反应的立体选择性和区域选择性受到强酸性和受限的亚氨基二亚磷酸酯催化剂的有效控制。计算研究揭示了反应性和选择性的起源。