Chemoselective S-benzylation of indoline-2-thiones using benzyl alcohols
作者:Mukund Jha、Oro Enaohwo、Ashley Marcellus
DOI:10.1016/j.tetlet.2009.10.050
日期:2009.12
Indoline-2-thiones were chemoselectively S-benzylated using a variety of benzyl alcohols by boron trifluoride etherate-catalyzed reactions. The aryl substituent effect on the reactivity of the benzyl alcohols toward S-benzylation is also discussed.
A nickel(II) catalyzed enantioselective thio-Claisen rearrangement of α-diazo pyrazoleamides with thioindoles was realized with modified chiral N,N′-dioxide ligands, affording a variety of C3-substituted indole derivatives in high yields (up to 95%) with excellent enantioselectivities (up to 96% ee) undermild reaction conditions. A possible transition state model was proposed based on previous reports