Total synthesis of (-)-solanapyrone A via enzymatic Diels-Alder reaction of prosolanapyrone

被引:86
作者
Oikawa, H [1 ]
Kobayashi, T [1 ]
Katayama, K [1 ]
Suzuki, Y [1 ]
Ichihara, A [1 ]
机构
[1] Hokkaido Univ, Fac Agr, Dept Biosci & Chem, Sapporo, Hokkaido 060, Japan
关键词
D O I
10.1021/jo980743r
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
The syntheses of prosolanapyrones I (6) and II (7) via the aldol reactions of pyrone and dienal segments have been achieved in five steps in 31% overall yield for 6 and seven steps in 5% overall yield for 7. An improved synthetic route starting from vinylpyrone 27 provided 7 in 11 steps in 12% overall yield. The enzymatic Diels-Alder reaction of 7 affords (-)-solanapyrone A (1) with high enantioselectivity and with good exo-selectivity, which is difficult to attain by chemical methods. In addition, a crude enzyme preparation from Alternaria solani has been used to perform a kinetic resolution of(+/-)-3.
引用
收藏
页码:8748 / 8756
页数:9
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