Asymmetric Synthesis of Chiral Sulfinate Esters and Sulfoxides. Synthesis of Sulforaphane
摘要:
Reaction of the chiral auxiliary trans-2-phenylcyclohexanol (1) with thionyl chloride afforded a nearly equal mixture of two diastereomeric chlorosulfite esters (6); Treatment of this mixture with an equivalent amount of a dialkylzinc reagent (Me, et, i-Pr) afforded high levels of conversion of both chlorosulfite esters to (mainly) a single diastereomer of the sulfinate ester (7). Levels of absolute stereochemical induction ranged from 10:1 to 96:4 under conditions affording high chemical yields. The method was employed for the separate synthesis of both enantiomers of sulforaphane (13).
Asymmetric Synthesis of Chiral Sulfinate Esters and Sulfoxides. Synthesis of Sulforaphane
摘要:
Reaction of the chiral auxiliary trans-2-phenylcyclohexanol (1) with thionyl chloride afforded a nearly equal mixture of two diastereomeric chlorosulfite esters (6); Treatment of this mixture with an equivalent amount of a dialkylzinc reagent (Me, et, i-Pr) afforded high levels of conversion of both chlorosulfite esters to (mainly) a single diastereomer of the sulfinate ester (7). Levels of absolute stereochemical induction ranged from 10:1 to 96:4 under conditions affording high chemical yields. The method was employed for the separate synthesis of both enantiomers of sulforaphane (13).
A convergent and high-yielding approach for the asymmetricsynthesis of sulforaphane 2 and four analogues differently substituted at the sulfinyl sulfur has been developed. The key step of the synthesis is the diastereoselectivesynthesis of sulfinate ester 23-SS, using the DAG (diacetone-d-glucofuranose)-methodology. The biological activity of these compounds as inductors of phase II detoxifying enzyme
已开发出一种收敛性和高产率的方法,用于不对称合成萝卜硫烷2和在亚磺酰基硫上被不同取代的四个类似物。合成的关键步骤是亚磺酸酯的非对映合成23 -小号小号,使用DAG(diacetone- d -glucofuranose)-methodology。通过确定它们激活细胞保护性转录因子Nrf2的能力,研究了这些化合物作为II期解毒酶诱导剂的生物活性。