2-((1,1-Dimethylethyl)imino)-N,N-diethylhexahydro-1,3-dimethyl-2lambda5-1,3,2-diazaphosphorin-2-amine → tert-butyl 2-(N-(5-bromo-2-methoxybenzyl)-2,2-dimethylchroman-6-sulfonamido)acetate

Participants

Reaction Conditions

Reaction Steps

To the solution of tert-butyl 2-(2,2-dimethylchroman-6-sulfonamido)acetate (500 mg, 1.407 mmol) in MeCN (15 mL) was added resin-supported BEMP (786 mg, 1.547 mmol) and 4-bromo-2-(bromomethyl)-1-methoxybenzene (500 mg, 1.786 mmol). The mixture was heated in a microwave synthesizer at 90° C. for 3 hours. The reaction mixture was filtered, rinsed alternatively by dichloromethane and methanol. The filtrate was concentrated to give a reddish orange residue, which was purified by silica chromatography to obtain a white powder (700 mg, 85% yield). 1H NMR (500 MHz, CDCl3) δ 7.56-7.50 (m, 2H), 7.34-7.29 (m, 2H), 6.81 (d, J=8.1 Hz, 1H), 6.66 (d, J=8.5 Hz, 1H), 4.47 (s, 2H), 3.88 (s, 2H), 3.71 (s, 3H), 2.78 (t, J=6.7 Hz, 2H), 1.82 (t, J=6.7 Hz, 2H), 1.38 (s, 9H), 1.34 (s, 6H). LRMS [ESI, MH−] m/z calcd for C25H33BrNO6S 554.12, found 554.1.

Provenance & Evidence