Benzyl mercaptan → (Z)-ethyl 3-(2-amino-5-(benzylthio)phenyl)but-2-enoate

Participants

Reaction Conditions

Reaction Steps

A solution of (Z)-ethyl 3-(2-amino-5-bromophenyl)but-2-enoate (3.3817 g, 11.90 mmol), xantphos (1.033 g, 1.785 mmol), pd2(dba)3 (0.545 g, 0.595 mmol), and n,n-diisopropylethylamine (6.24 ml, 35.7 mmol) in 24 mL dioxane was heated to 80° C. then was treated with benzyl mercaptan (2.252 ml, 19.04 mmol). After stirring for 36 hours, an additional portion of xantphos (1.033 g, 1.785 mmol), pd2(dba)3 (0.545 g, 0.595 mmol), and n,n-diisopropylethylamine (6.24 ml, 35.7 mmol) was added, and the reaction mixture was heated to 90° C. overnight. The reaction mixture was then poured into water and was extracted with DCM. The organics were dried over MgSO4 and concentrated. Purification of the crude residue by silica gel column chromatography (0-100% EtOAc/heptane) gave (Z)-ethyl 3-(2-amino-5-(benzylthio)phenyl)but-2-enoate (2.26 g, 6.90 mmol, 58.0% yield). m/z (ESI) 328.2 (M+H)+.

Provenance & Evidence