Allylic Alcohol Transposition by Ortho Ester-Initiated Carbonate Extension. Synthesis of the Vasodilator 11(<i>R</i>),12(<i>S</i>),15(<i>S</i>)-Trihydroxyeicosa- 5(<i>Z</i>),8(<i>Z</i>),13(<i>E</i>)-trienoic Acid
作者:Raymond E. Conrow
DOI:10.1021/ol0608808
日期:2006.5.1
[reaction: see text] The title compound 1 was obtained via methyl ester 2, which was synthesized in four steps from an isomeric 11,14,15-triol ester 5. In the key step, Boc orthoformate 9 was treated with TMS triflate to initiate intramolecular nucleophilic substitution with allylic transposition, forming cyclic carbonates 10 and 11.
[反应:见正文]标题化合物1是通过甲酯2获得的,该甲酯是由11、14、15-三醇酯5的异构体通过四个步骤合成的。在关键步骤中,用三氟甲磺酸TMS处理原甲酸Boc 9用烯丙基转座引发分子内亲核取代,形成环状碳酸酯10和11。