First Highly Stereoselective Synthesis of Fungicide Systhane
摘要:
[GRAPHICS]Highly enantiopure (R)-2-p-chlorophenyl-2-(1H-1,2,4-triazol-1-ylmethyl)hexanenitrile 1 (myclobutanil or systhane) was obtained in six synthetic steps from commercially available 1-hexyne (35% yield, 92% ee). The sulfinyl group controls the two key steps of the synthetic sequence, the highly stereoselective hydrocyanation of vinyl sulfoxides with Et(2)AICN and the further introduction of the proper functionality into the molecule.
First Highly Stereoselective Synthesis of Fungicide Systhane
作者:José L. García Ruano、Marta Cifuentes García、Ana M. Martín Castro、Jesús H. Rodríguez Ramos
DOI:10.1021/ol0168723
日期:2002.1.1
[GRAPHICS]Highly enantiopure (R)-2-p-chlorophenyl-2-(1H-1,2,4-triazol-1-ylmethyl)hexanenitrile 1 (myclobutanil or systhane) was obtained in six synthetic steps from commercially available 1-hexyne (35% yield, 92% ee). The sulfinyl group controls the two key steps of the synthetic sequence, the highly stereoselective hydrocyanation of vinyl sulfoxides with Et(2)AICN and the further introduction of the proper functionality into the molecule.
Chemoenzymatic Synthesis of Optically Active 2-Phenyl-2-(1H-1,2,4-triazol-1-ylmethyl)hexanenitrile
作者:Dai Sig Im、Chan Seong Cheong、So Ha Lee、Byoung Hee Youn、Seok Chan Kim
DOI:10.1016/s0040-4020(00)00031-4
日期:2000.3
Abstract (±)-2-Cyano-2-phenyl-1-hexanol 3 was resolved to each enantiomer using Candida rugosa and Pseudomonas fluorescens lipases in 62 and 99% ee, respectively. The absolute stereochemistry of one of the enantiomers was determined to be (S) by diastereomeric amide formation and X-ray crystallography. The resolved alcohols of (R)- and (S)-isomer were transformed to Systhane® analogues.