Multi-step reaction with 11 steps
1.1: (+)-diisopinocampheylboron chloride / diethyl ether / 1 h / cooling
1.2: diethyl ether / 1 h / -100 °C
2.1: 93 percent / imidazole / dimethylformamide / 18 h / 20 °C
3.1: O3 / CH2Cl2 / -78 °C
3.2: PPh3 / CH2Cl2 / 2 h / 20 °C
4.1: (+)-diisopinocampheylboron chloride / diethyl ether / 1 h / cooling
4.2: diethyl ether / 1 h / -100 °C
4.3: TBAF / tetrahydrofuran / 1.5 h / 20 °C
5.1: 86 percent / 2,6-lutidine / CH2Cl2 / 1 h / 20 °C
6.1: O3 / CH2Cl2 / -78 °C
6.2: PPh3 / CH2Cl2 / 2 h / 20 °C
7.1: (+)-diisopinocampheylboron chloride / diethyl ether / 1 h / cooling
7.2: diethyl ether / 1 h / -100 °C
8.1: 90 percent / 2,6-lutidine / CH2Cl2 / 1 h / 20 °C
9.1: O3 / CH2Cl2 / -78 °C
9.2: PPh3 / CH2Cl2 / 2 h / 20 °C
10.1: (+)-diisopinocampheylboron chloride / diethyl ether / 1 h / cooling
10.2: diethyl ether / 1 h / -100 °C
11.1: 71 percent / Et3N; DMAP / CH2Cl2 / 0.75 h / 20 °C
With
1H-imidazole; 2,6-dimethylpyridine; dmap; ozone; triethylamine; B-chlorodiisopinocampheylborane;
In
diethyl ether; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1021/jo049275d