Patent ID: 8580976

Claim:
A process for preparing a stable 2-substituted benzofuran-3-yl borate ester corresponding to the formula: said process comprising contacting 3-bromo-2-substituted-benzofuran corresponding to the formula: with an C 1-4 alkyllithium at a temperature less than −60° C. to form 3-lithio-2-substititued-benzofuran, contacting the 3-lithio-2-substituted- benzofuran at a temperature less than −60° C. with an borate ester corresponding to the formula: and recovering the resulting borate ester product, wherein, R W is C 1-4 alkyl; R x is C 1-10 hydrocarbyl or halohydrocarbyl; and R Y independently each occurrence is C 1-10 hydrocarbyl, halohydrocarbyl or trialkylsilylhydrocarbyl or 2 R Y groups together are a divalent hydrocarbylene of up to 20 carbons.