Cyclopropylboronic acid → tert-butyl 4-(adamantan-1-ylmethoxy)-2-fluoro-5-((E)-prop-1-en-1-yl)benzoate

Participants

Reaction Steps

Following the procedure as described in Example 305/306 Step 2 and making variations as required to replace tert-butyl 4-(1,4-dioxaspiro[4.5]decan-8-ylmethoxy)-5-chloro-2-fluorobenzoate with tert-butyl 4-(adamantan-1-ylmethoxy)-5-chloro-2-fluorobenzoate and to replace cyclopropylboronic acid with trans-propenylboronic acid pinacol ester, tert-butyl 4-(adamantan-1-ylmethoxy)-2-fluoro-5-((E)-prop-1-en-1-yl)benzoate was obtained as a yellowish oil (1.20 g, quant.). To a mixture of tert-butyl 4-(adamantan-1-ylmethoxy)-2-fluoro-5-((E)-prop-1-en-1-yl)benzoate (0.30 g, 0.75 mmol) in dichloromethane (5 mL) was added trifluoroacetic acid (1 mL) and the reaction mixture was stirred at ambient temperature for 2 hours. Concentration in vacuo gave the title compound as a yellowish residue (0.260 g, quant.) which was used without further purification: MS (ES+) m/z 345.2 (M+1).

Provenance & Evidence