Facile synthesis of α-trifluoromethylated alcohols from trifluoroacetaldehyde ethyl hemiacetal
作者:Toshio Kubota、Masahiro Iijima、Tatsuo Tanaka
DOI:10.1016/s0040-4039(00)91620-4
日期:1992.3
Trifluoroacetaldehyde ethylhemiacetal reacted with nucleophilic organosilanes such as cyanotrimethylsilane, allyltrimethylsilane, or enol trimethylsilyl ethers in the presence of Lewis acid to afford a series of α-trifluoromethylated alcohols in high yield.
conversion into its 2-oxo derivative in the cell, was accessed from trifluoroacetaldehyde hydrate via hydroxypropanenitrile 21, which was silylated and reduced to the aldehyde (±)-23. Diastereoselectiveaddition of diethyl trimethylsilylphosphite furnished diastereomeric α-siloxyphosphonates. The less polar one was converted to the desired racemic phosphonic acid (±)-(1R*,2R*)-9 as its ammonium salt.
合成了三种功能化的丙基膦酸,以研究华氏疟原虫PMY1中的C-P键裂解。(R)-1-羟基-2-氧代丙基膦酸[(R)-5 ]是通过手性拆分(±)-二甲基1-羟基-2-甲基烯丙基膦酸酯[(±)-12 ]制备的,然后进行臭氧分解和脱保护。 。所述ñ - (大号-丙氨酰) -取代的(1 - [R,2 - [R)-2-氨基-1- hydroxypropylphosphonic酸10,为2-氧代丙基膦(潜在的前体5中的细胞),是由氨基膦酸与偶合得到苯并三唑激活ž -L-丙氨酸和氢解脱保护。从三氟乙醛中获得了(1 R *,2 R *)-1,2-二羟基-3,3,3-三氟丙基膦酸(一种转化为细胞中的2-氧代衍生物后潜在的C-P键断裂的抑制剂)通过羟基丙腈21进行水合,甲硅烷化并还原成醛(±)-23。亚磷酸二乙基三甲基甲硅烷基酯的非对映选择性加成得到非对映异构体α-甲硅烷氧基膦酸酯。极性较小的铵盐以其铵盐的形式转化为所需的外消旋膦酸(±)-(1
Synthesis of optically active β-keto-γ-butyrolactones having a trifluoromethyl group
作者:Tomoya Kitazume
DOI:10.1016/s0022-1139(00)85012-5
日期:1987.3
A number of chiral β-keto-γ-butyrolactones and tetronic acids bearing a trifluoromethyl group on an asymmetric carbon were prepared by ultrasound-promoted Reformatsky-type reactions between an optically active O-trimethylsilylated cyanohydrin of trifluoroacetaldehyde and ethyl α-substituted bromoacetates.