First total synthesis and determination of the absolute configuration of strictifolione, a new 6-(ω-phenylalkenyl)-5,6-dihydro-α-pyrone, isolated from Cryptocarya strictifolia
作者:Lia Dewi Juliawaty、Yoshimi Watanabe、Mariko Kitajima、Sjamsul Arifin Achmad、Hiromitsu Takayama、Norio Aimi
DOI:10.1016/s0040-4039(02)02181-0
日期:2002.11
Starting from (S)-malic acid and (S)-glycidol, the first total synthesis of strictifolione, a new 6-(ω-phenylalkenyl)-5,6-dihydro-α-pyrone isolated from Cryptocarya strictifolia, was accomplished, which confirmed its structure including the absoluteconfiguration of the asymmetric centers.
Preparation of quinoline-substituted carbonate and carbamate derivatives
申请人:——
公开号:US20020013468A1
公开(公告)日:2002-01-31
The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.
Asymmetric Total Synthesis of Callystatin A: Asymmetric Aldol Additions with Titanium Enolates of Acyloxazolidinethiones
作者:Michael T. Crimmins、Bryan W. King
DOI:10.1021/ja9817500
日期:1998.9.1
employing acyl oxazolidinethione 6 (Scheme 4). The synthesis of aldehyde 4 began with S-glycidol 7 as illustrated in Scheme 2. Protection of S-glycidol as its TBDPS ether followed by copper-catalyzed epoxide opening with vinylmagnesium bromide provided the alcohol 8 in 85% overall yield. Conversion of the secondary alcohol to the isopropoxy propenyl ether provided a mixed acetal which was exposed to the
已从链霉菌属菌株中分离出许多具有相似总体化学结构的高细胞毒性聚酮化合物,包括 Anguinomycins、1 leptofuranins、2 Leptomycin、3 和 kazusamycin,4。最近,从长崎县的海绵海绵体 Callyspongia truncata 中分离出了一种结构相关的聚酮化合物 calystatin A 1。5 Callystatin A 对 KB 细胞显示出显着的体外细胞毒性 (IC50 0.01 ng/mL)。calystatin A 的相对和绝对立体结构是通过光谱方法和化学合成的组合建立的。 5-7 天然来源的 calystatin A 数量有限,以及进行相关抗肿瘤合成和结构解析的可能性抗生素,促使我们追求卡利斯他汀 A 的全合成。8 在这里,我们公开了 (-)-callystatin A 的不对称全合成,利用我们最近开发的不对称羟醛方案与酰基恶唑烷硫酮的氯钛烯醇化物。9
Process for producing erythromycin derivative
申请人:——
公开号:US20030191295A1
公开(公告)日:2003-10-09
There is provided a preparation process useful for an efficient synthesis of 6-O-substituted ketolide derivatives by combining a characterized step of introduction of a substituent at the 6-position by selective cleavage of a C—O bond of the cyclic acetal at the 9-position side via 6,9-cyclic acetal 5-O-desosaminyl erythronolide derivative, a step of conversion into carbonyl groups at the 9- and 3-positions, and a step of 11,12-cyclic carbamation to lead to 6-O-substituted ketolide derivatives.
[EN] PREPARATION OF QUINOLINE-SUBSTITUTED CARBONATE AND CARBAMATE DERIVATIVES<br/>[FR] PREPARATION DE DERIVES DE CARBONATE ET DE CARBAMATE A SUBSTITUTION QUINOLINE
申请人:ABBOTT LAB
公开号:WO2001000582A1
公开(公告)日:2001-01-04
The invention relates to a process for preparing quinoline-substituted carbonate and carbamate compounds, which are important intermediates in the synthesis of 6-O-substituted macrolide antibiotics. The process employs metal-catalyzed coupling reactions to provide a carbonate or carbamate of formula (I) or (II) or a substrate that can be reduced to obtain the same.