Multi-step reaction with 7 steps
1.1: 90 percent / p-TsOH / benzene / 4 h / 80 °C
2.1: Li; tert-butyl alcohol / liquid ammonia; diethyl ether / 0.5 h / -78 - -45 °C
2.2: isoprene / liquid ammonia; diethyl ether / -78 - -45 °C
2.3: 87 percent / diethyl ether / 2 h / -78 - 0 °C
3.1: NaH / hexamethylphosphoric acid triamide / 3 h / 25 °C
3.2: 95 percent / hexamethylphosphoric acid triamide / 2 h / 25 °C
4.1: Li / liquid ammonia; 1,2-dimethoxy-ethane / 0.33 h / -78 - -33 °C
4.2: 61 percent / 1,2-dimethoxy-ethane; liquid ammonia / 1 h / -78 - -33 °C
5.1: 95 percent / 1 M HCl / tetrahydrofuran / 25 °C
6.1: 91 percent / diethyl ether / 1 h / 25 °C
7.1: 86 percent / AIBN / xylene / 18 h / 120 °C
With
hydrogenchloride; 2,2'-azobis(isobutyronitrile); lithium; sodium hydride; toluene-4-sulfonic acid; tert-butyl alcohol;
In
tetrahydrofuran; N,N,N,N,N,N-hexamethylphosphoric triamide; 1,2-dimethoxyethane; diethyl ether; ammonia; xylene; benzene;
DOI:10.1021/jo0159035