... Tetrahedron. Volume 65, Issue 1, 3 January 2009, Pages 128–133. ... According to the procedure described for the synthesis of compound 5a, treatment of the compound 4b (378 mg, 1.18 mmol) in THF (10 mL) with an 1 M solution of borane in THF (3.6 mL, 3.6 mmol) yielded the ...