Concise Syntheses of Coronarin A, Coronarin E, Austrochaparol and Pacovatinin A
摘要:
从合成产物(+)-albicanyl acetate (6)中获得了(+)-coronarin A (1)、(+)-coronarin E (2)、(+)-austrochaparol (3)和(+)-pacovatinin A (4)的完全合成。(+)-albicanol (5)的Dess-Martin氧化反应来自化学酶产物(6),生成醛(7),后者与β-呋喃甲基杂芳砜(8或9)进行Julia一锅法烯化反应,得到具有高顺式选择性的(+)-反式coronarin E (2)和(+)-顺式coronarin E (12)。从(+)-反式coronarin E (2)中获得了(+)-coronarin A (1)的合成,而(+)-顺式coronarin E (12)则转化为天然产物(+)-(5S,9S,10S)-15,16-epoxy-8(17),13(16),14-labdatriene (13)和(+)-austrochaparol (3)。通过(+)-3的不对称合成,确定(+)-3的绝对结构为5S,7R,9R,10S构型。(+)-albicanol (5)的同分异构化反应后,发生烯丙基氧化反应,生成(7α)-
Concise Syntheses of Coronarin A, Coronarin E, Austrochaparol and Pacovatinin A
摘要:
从合成产物(+)-albicanyl acetate (6)中获得了(+)-coronarin A (1)、(+)-coronarin E (2)、(+)-austrochaparol (3)和(+)-pacovatinin A (4)的完全合成。(+)-albicanol (5)的Dess-Martin氧化反应来自化学酶产物(6),生成醛(7),后者与β-呋喃甲基杂芳砜(8或9)进行Julia一锅法烯化反应,得到具有高顺式选择性的(+)-反式coronarin E (2)和(+)-顺式coronarin E (12)。从(+)-反式coronarin E (2)中获得了(+)-coronarin A (1)的合成,而(+)-顺式coronarin E (12)则转化为天然产物(+)-(5S,9S,10S)-15,16-epoxy-8(17),13(16),14-labdatriene (13)和(+)-austrochaparol (3)。通过(+)-3的不对称合成,确定(+)-3的绝对结构为5S,7R,9R,10S构型。(+)-albicanol (5)的同分异构化反应后,发生烯丙基氧化反应,生成(7α)-
Allylic sulfides were synthesized from allylic alcohols 1 using S, S'-bis(1-phenyl-1H-tetrazol-5-yl) dithiocarbonate (2) by means of a single-step reaction. The allylic sulfides were coupled with a Grignard reagent or carbanion in the presence of a catalytic amount of copper(I) bromide or palladium(0).