The Reaction of (4R,5R)- and (4S,5S)-4,5-Epoxy-2(E)-Hexenoates and Secondary Amines.
作者:Chikako SAOTOME、Machiko ONO、Hiroyuki AKITA
DOI:10.1248/cpb.49.849
日期:——
A reaction of methyl (4R,5R)-4,5-epoxy-2(E)-hexenoate 1 with N-benzylmethylamine gave a diastereomerically pure methyl (4R,5R)-4,5-epoxy-(3S)-N-benzylmethylamino hexanoate 6 and methyl (4S,5R)-4-N-benzyl-methylamino-5-hydroxy-2(E)-hexenoate 7. The former was chemoenzymatically converted to (-)-osmundalactone 11, which is an aglycone of osmundalin. On the other hand, the directly conjugated addition
(4R,5R)-4,5-环氧-2(E)-己酸甲酯1与N-苄基甲胺的反应得到非对映异构纯的甲基(4R,5R)-4,5-环氧-(3S)-N-苄基甲基氨基己酸酯6和(4S,5R)-4-N-苄基-甲基氨基-5-羟基-2(E)-己烯酸酯7。前者经化学酶法转化为(-)-osmundalactone 11,后者是osmundalin的苷元。 。另一方面,将二甲胺直接共轭加成到(4S,5S)-4,5-环氧-2(E)-己酸甲酯1中,然后在40℃下用MeOH处理,独家提供甲基(4R,5S)- 4-二甲基氨基-5-羟基-2(E)-己酸酸酯16,将其转化为L-(-)-山os糖18。