Multi-step reaction with 5 steps
1.1: 14.64 g / silica gel / CH2Cl2; H2O / 72 h / 20 °C
2.1: 97 percent / DMSO; oxalyl chloride; Et3N / CH2Cl2 / 1.5 h / -60 - 20 °C
3.1: Cu(OAc)2*H2O; 2,2-bis[(3aS,8aR)-3a,8,8a-3H-indeno[3,2-d]oxazol-2yl]propane / ethanol / 120 h / 20 °C
3.2: 2,6-lutidine / CH2Cl2 / 16.5 h / 0 - 20 °C
3.3: HCO2NH4 / Pd/C / methanol / 24 h / 20 °C
4.1: 2.252 g / Et3N / CH2Cl2 / 70 h / 20 °C
5.1: 64 percent / (+/-)-camphorsulfonic acid; ethylene glycol / tetrahydrofuran / 48 h / 50 °C
With
copper diacetate; oxalyl dichloride; 2,2-bis[(3aS,8aR)-3a,8,8a-3H-indeno[3,2-d]oxazol-2yl]propane; camphor-10-sulfonic acid; silica gel; ethylene glycol; dimethyl sulfoxide; triethylamine;
In
tetrahydrofuran; ethanol; dichloromethane; water;
2.1: Swern oxidation / 3.1: Henry reaction;
DOI:10.1021/ol0503182