We report the enantioselective synthesis of pseudolaric acidB (1a), a diterpene acid isolated from the bark of Pseudolarix kaempferi Gordon, which displays interesting antifungal, antifertility, and cytotoxic activity against multidrug resistant cell lines. Our synthesis utilizes a highly efficient metal-catalyzed [5 + 2] vinylcyclopropane-alkyne intramolecular cycloaddition to construct the polyhydroazulene
我们报告了对映选择性合成假落叶松酸 B (1a),一种从 Pseudolarix kaempferi Gordon 树皮中分离的二萜酸,它对多药耐药细胞系显示出有趣的抗真菌、抗生育和细胞毒活性。我们的合成利用高效金属催化的 [5 + 2] 乙烯基环丙烷-炔烃分子内环加成来构建天然产物的聚氢茚核。通过分子内烷氧基羰基环化形成季中心和高度非对映选择性的乙炔化铈加成到甲基酮以引入酸侧链,对假落叶松酸的三环支架的加工完成。
Process for producing monomer
申请人:——
公开号:US20040236051A1
公开(公告)日:2004-11-25
A process for producing a monomer for resists represented by the following general formula 1:
1
wherein R
1
represents hydrogen or an optionally substituted alkyl group; R
2
, R
3
and R
4
each independently represent hydrogen or a substituent; and X, Y and Z each independently represent a direct bond or an optionally substituted alkylene group with 1 to 3 chain members,
the process comprising carrying out esterification or transesterification in the presence of a biocatalyst.
A process for producing a monomer for resists represented by the following general formula 1:
wherein R1 represents hydrogen or an optionally substituted alkyl group; R2, R3 and R4 each independently represent hydrogen or a substituent; and X, Y and Z each independently represent a direct bond or an optionally substituted alkylene group with 1 to 3 chain members,
the process comprising carrying out esterification or transesterification in the presence of a biocatalyst.