Multi-step reaction with 7 steps
1: 1) DMAP, isopropenyl chloroformate / 1) CH2Cl2, -5 degC to 0 degC, 2 h, 2) ethyl acetate, reflux, 30 min
2: 5.58 g / sodium borohydride / CH2Cl2; acetic acid / 3 h
3: 1) HMPA, 2) C6H5CH2Br / 1) THF, -78 degC, 50 min, 2) THF, -78 degC, 30 min
4: 1) 1M LiOH, 2) PPTS / 1) THF, 1.5 h, 2) CH2Cl2, r.t., 2 h
5: diphenylphosphoryl azide, Et3N / xylene / 2 h / 90 °C
6: DMAP / 15 h
7: 96 percent / H2 / 10percent Pd/C / acetic acid / 21 h
With
N,N,N,N,N,N-hexamethylphosphoric triamide; dmap; lithium hydroxide; sodium tetrahydroborate; Isopropenyl chloroformate; diphenylphosphoranyl azide; hydrogen; pyridinium p-toluenesulfonate; benzyl bromide; triethylamine;
palladium on activated charcoal;
In
dichloromethane; acetic acid; xylene;
DOI:10.1016/S0040-4020(01)80342-2