Lewis Acid‐Catalyzed Stereoselective α‐Addition of Chiral Aldehydes to Cyclic Dienol Silanes: Aqueous Synthesis of Chiral Butenolides
作者:Anna Adamkiewicz、Izabela Węglarz、Aleksandra Butkiewicz、Marta Woyciechowska、Jacek Mlynarski
DOI:10.1002/adsc.201901218
日期:2020.2.6
stereoselective α‐addition to cyclic dienol silanes has rarely been exploited, in contrast to the well‐studied γ‐addition of conjugated butenolides. In this study, an unprecedent catalytic Mukaiyama aldol α‐addition of 2‐trimetylsiloxy furan to optically pure aldehydes in water‐containing solvents is reported. The synthetic utility of this concept was demonstrated in the efficient synthesis of six bioactive natural
与对丁二酸内酯共轭的γ-加成研究相比,对环二烯醇硅烷的立体选择性α-加成很少被利用。在这项研究中,报道了在含水溶剂中空前催化2-三甲硅氧基甲氧基呋喃的Mukaiyama aldolα-加成到光学纯醛中的现象。该概念的合成效用在六种生物活性天然产物的有效合成中得到了证明:维特索利德D,姜黄素肌醇C,短毛菌素,海胆碱C,(+)- Coronarin E和(E)-labda‐7,11,13‐trien‐ 16,15-橄榄。