(7) has been converted to (1). Oxidation of sodium erythorbate to (8) followed by selective monotosylation and treatment with sodium ethoxide provided (10). Swern oxidation of this epoxide into the aldehyde (11), formation with tert-butylglycinate and an reaction with phthalimidoacetyl chloride afforded the (3S,4S)-cis- (13). Appropriate functional group manipulations followed by a condensation, chlorination
(7)已转换为(1)。将
异抗坏血酸钠氧化成(8),然后进行选择性单磺酰化并用
乙醇钠处理(10)。此
环氧化物的Swern氧化成醛(11),形成与叔-butylglycinate和用苯二
甲酰氯反应,得到(3小号,4小号) -顺式- (13)。适当的功能组操作,然后进行缩合,
氯化和保护基团的去除产生了对映异构纯的劳拉卡帕夫核(24)。