Multi-step reaction with 7 steps
1: 55 percent / tetrahydrofuran / 25 °C
2: 4.23 g / thiourea / propan-2-ol / 0.5 h / Heating
3: 61 percent / i-Pr2NEt, DMAP / CH2Cl2 / 1.) 0 deg C, 45 min, 2.) 25 deg C, 16 h
4: 59 percent / NaHMDS / tetrahydrofuran / -78 °C / 1.) 45 min, 2.) 2 h
5: TFA / CH2Cl2 / 1.) 0 deg C, 30 min, 2.) 25 deg C, 3 h
6: 73 percent / i-Pr2NEt, BOP*PF6 / dimethylformamide / 25 h / 25 °C
7: 30 percent H2O2, LiOH*H2O / H2O; trifluoroacetic acid / 1.) 0 deg C, 1.5 h, 2.) 25 deg C, 3.5 h
With
dmap; lithium hydroxide; dihydrogen peroxide; sodium hexamethyldisilazane; (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate; N-ethyl-N,N-diisopropylamine; thiourea; trifluoroacetic acid;
In
tetrahydrofuran; dichloromethane; water; N,N-dimethyl-formamide; isopropyl alcohol; trifluoroacetic acid;
DOI:10.1016/S0968-0896(98)00265-X