1: cyclopent-2-enone With zinc(II) chloride in tetrahydrofuran Diels-Alder reaction; 0.25 h; 2: trans-1-methoxy-3-(trimethylsilyloxy)-1,3-butadiene in dichloromethane T=22°C; Diels-Alder reaction; 168 h; 3: With hydrogenchloride in water T=20°C;
Bulletin of the Academy of Sciences of the USSR, Division of Chemical Science (English Translation), , p. 108 - 112
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, , # 1 p. 127 - 132
