作者:Marc-Etienne Schwenter、Pierre Vogel
DOI:10.1002/1521-3765(20001117)6:22<4091::aid-chem4091>3.0.co;2-w
日期:2000.11.17
A new approach to the asymmetric synthesis of pentadeca-1,3,5,7,9,11,13,15-octols and their derivatives is presented. It is based on the Sharpless asymmetric dihydroxylation (AD) of 4,4'-methylene[(1R,1'S,6R,6'S)-6-acetoxycyclohept-3-en-1-yl]bis(4-methoxybenzoate) (9), derived from a double [3+4] cycloaddition of the 1,1,3-trichloro-2-oxyallyl cation with 2,2'-methylenedifuran (1). The diol (-)-10
提出了一种新的不对称合成pentadeca-1,3,5,7,9,11,13,15-辛醇及其衍生物的方法。它基于4,4'-亚甲基[(1R,1'S,6R,6'S)-6-乙酰氧基环庚-3-烯-1-基]双(4-甲氧基苯甲酸酯)的Sharpless不对称二羟基化(AD)(9)衍生自1,1,3-三氯-2-氧基烯丙基阳离子与2,2'-亚甲基二呋喃(1)的双[3 + 4]环加成。以“ AD-mix-beta(5x)”从9中以98.4%ee获得的二醇(-)-10被氧化成(2R和2S,4S,6R)-四氢-2-羟基-6-((4S ,6S)-(6-羟基-4-[(4-甲氧基苯甲酰基)氧基]环庚-1-烯-1-基)-2-氧丙基)-2H-吡喃-4-基4-甲氧基苯甲酸酯((-)- 18)。通过结合Evans的anti和Nasaraka的aldol(-)-18顺式还原与双重Mitsunobu反应,形成16个非对映异构体pentadeca-1