The Pronucleotide Approach. I. Synthesis, Anti-HIV Activity and Preliminary Stability Studies of MononucleosideS,S′-Bis(O-acyl-2-oxyethyl) Phosphorodithiolates
摘要:
The synthesis, in vitro anti-HIV activity, and preliminary stability studies of several mononucleoside phosphorodithiolate derivatives incorporating a new kind of biolabile phosphate-protection, namely O-pivaloyl-2-oxyethyl, are reported. Our preliminary results strongly support the hypothesis that such pronucleotides exert their biological effects via intracellular delivery of the corresponding 5'-mononucleotide.
The synthesis and in vitro anti-HIV activity of a novel series of pronucleotides are reported. These prodrugs were characterized by a phosphorodithiolate structure, incorporating two O-pivaloyl-2-oxyethyl substituents as biolabile phosphate protections. The compounds were obtained following an original one-pot three-step procedure, involving the formation of a phosphorodithioite intermediate which
报道了一系列新型原核苷酸的合成和体外抗 HIV 活性。这些前药的特征在于二硫代磷酸酯结构,结合了两个O -pivaloyl-2-oxyethyl 取代基作为生物不稳定的磷酸盐保护。这些化合物是按照原始的一锅三步程序获得的,包括形成原位氧化的二硫代磷酸酯中间体。在体外,比较抗 HIV 评估表明,这种原始前药能够使相应的 5'-单核苷酸在细胞内有效释放。2',3'-双脱氧腺苷 (ddA) 3的前核苷酸在各种细胞系中表现出非常有效的抗逆转录病毒作用,在纳摩尔浓度范围内具有 50% 的有效浓度 (EC 50 ) 值。在原代单核细胞/巨噬细胞中,该衍生物抑制 HIV 复制的效力 (EC 50 0.23 pM) 是 ddA 的500 倍,前药的选择性指数是母体核苷的 50 倍。
Generation of Alkyl Radicals from Thiols via Zinc Thiolates: Application for the Synthesis of
<i>gem</i>
‐Difluorostyrenes
作者:Vyacheslav I. Supranovich、Vitalij V. Levin、Vladimir A. Kokorekin、Alexander D. Dilman
DOI:10.1002/adsc.202100088
日期:2021.6.8
Reaction of thiols with α-(trifluoromethyl)styrenes under photocatalytic conditions leading to desulfurative allylic fluorine substitution is described. The reaction is performed by treatment of thiols with benzyl zinc chloride to generate zinc thiolates followed by visible light induced desulfurization by means of triphenylphosphine. Radicals formed after the C−S bond cleavage react with the double
A 2-5A analog represented by the formula (1):
wherein m is 0 or 1; n is 0 to 2; R
1
represents an alkoxy group having from 1 to 6 carbon atoms which may be substituted, an unprotected mercapto group, a mercapto group protected by a nucleic acid synthesis protecting group, or an alkylthio group having from 1 to 4 carbon atoms which may be substituted; R
2
, R
3
, R
4
, R
5
and R
6
represent an unprotected hydroxyl group, a hydroxyl group protected by a nucleic acid synthesis protecting group, an alkoxy group having from 1 to 6 carbon atoms which may be substituted, an unprotected mercapto group, a mercapto group protected by a nucleic acid synthesis protecting group, or an alkylthio group having from 1 to 4 carbon atoms which may be substituted; R
7
represents an oxygen atom, or a —O(CH
2
CH
2
O)q-group, wherein q is 2 to 6; R
8
represents a hydrogen atom, an alkyl group having from 1 to 6 carbon atoms which may be substituted, or a 5′-phosphorylated oligonucleotide analog which has one hydroxyl group removed from the 5′-phosphoric acid group; E
1
, E
2
, E
3
and E
4
represent a naturally occurring or modified nucleic acid unit, or a pharmacologically acceptable salt thereof.
A stabilizing composition for halogen-containing polymers, comprising a diorganotin oxide compound such as dibutyl or dioctyl tin oxide, an ethylenically unsaturated dicarboxylic acid ester compound such as dibutyl or dioctyl maleate and a mercaptan-containing organic compound such as isooctyl mercaptopropionate.
The density of rigid foamed articles made by the thermal decomposition of a blowing agent in a vinyl chloride polymer is reduced by the use of an organotin mercaptoalkylcarboxylate, alone, or in combination with an organotin halide or carboxylate which activate the blowing agent. Sulfides made from said organotin mercaptoalkylcarboxylate are also superior activators of the blowing agent.