本篇研究是以D-Ribose作為起始物合成目標天然物(+)-Pericosine A, (-)-Pericosine C和(+)-Pericosine E。主要的反應有Wittig反應和Swern氧化反應。以[α-(Alkoxycarbonyl)vinyl]aluminium作為具有非鏡像選擇性的羰基加成反應可得到重要的中間產物8a和8b。(+)-Pericosine A可在化合物8a進行環合置換(Ring-Closing Metathesis)反應後，參考Stevenson教授的合成方法而得。化合物8a經由環合置換反應合環、鈀催化的allylic substitution後可得到(-)-Pericosine C。(+)-Pericosine E應亦可藉由鈀催化的allylic substitution而得，然而尚在進行中。;Successfully synthesizing natural product (+)-Pericosine A, (-)-Periciosine C,(+)-Pericosine E was the aim. The main reactions we used are Wittig reaction, Swern oxidation, [α-(Alkoxycarbonyl)-vinyl]aluminum reaction and Palladium-catalyzed allylic substitution. Diastereomeric intermediate 8a and 8b can be synthesized via [α-(Alkoxycarbonyl)-vinyl]aluminum reaction which the ratio is 4 to 1. (+)-Pericosine A was obtained by compound 8a through Ring-Closing metathesis then directly referring to Prof. Stevenson’s method. (-)-Pericosine C was obtained by compound 8a via Ring-Closing Metathesis and Palladium-catalyzed allylic substitution successfully. (+)-Pericosine E might can be synthesized by Palladium-catalyzed allylic substitution, but still doing effort right now.
