A practical and scaleable total synthesis of the jaborandi alkaloid (+)-pilocarpine
作者:Stephen G. Davies、Paul M. Roberts、Peter T. Stephenson、Helen R. Storr、James E. Thomson
DOI:10.1016/j.tet.2009.07.010
日期:2009.9
The total synthesis of (+)-pilocarpine (as its nitrate salt) has been achieved in nine steps and 30% overall yield starting from racemic 2-(2′,2′-dimethoxyethyl)propane-1,3-diol, which was desymmetrised via an enzymatic protocol. A high yielding synthesis of a key α-ethylidene lactone precursor has been developed, which involves the palladium-catalysed decarboxylation/carbonylation of a 1,3-dioxan-2-one
Syntheses of the racemic jaborandi alkaloids pilocarpine, isopilocarpine and pilosinine
作者:Stephen G. Davies、Paul M. Roberts、Peter T. Stephenson、James E. Thomson
DOI:10.1016/j.tetlet.2009.03.021
日期:2009.7
The synthesis of racemic pilocarpine has been achieved in high overall yield. Two alternative approaches for the formation of the γ-butyrolactone ring are described: the first involves a palladium-catalysed carbonylation reaction of a homopropargylic alcohol, whereas the second involves the palladium-catalysed decarboxylation/carbonylation of a 1,3-dioxan-2-one. Subsequent hydrogenation of an α-ethylidene