Domino Strategy for the Stereoselective Construction of Angularly Fused Tricyclic Ethers
摘要:
A stereoselective synthesis of decahydrofuro [3,2-d]-isochromene derivatives has been achieved by the condensation of cyclohexenylbutane-1,4-diol with aldehydes in the presence of a stochiometric amount of BF3 center dot OEt2 in dichloromethane at -78 degrees C. Similarly, the condensation of 2-cyclopentenylbutan-1,4-diol with aldehydes provides the corresponding octahydro-2H-cyclopenta[c]furo-[2,3-d]pyran derivatives in good yields with high diastereoseleetivity. It is an,elegant strategy for the quick construction of tricyclic architectures with four contiguous stereogenic centers in a single step. These tricyclic frameworks are the integral part of numerous natural products.
Domino Strategy for the Stereoselective Construction of Angularly Fused Tricyclic Ethers
摘要:
A stereoselective synthesis of decahydrofuro [3,2-d]-isochromene derivatives has been achieved by the condensation of cyclohexenylbutane-1,4-diol with aldehydes in the presence of a stochiometric amount of BF3 center dot OEt2 in dichloromethane at -78 degrees C. Similarly, the condensation of 2-cyclopentenylbutan-1,4-diol with aldehydes provides the corresponding octahydro-2H-cyclopenta[c]furo-[2,3-d]pyran derivatives in good yields with high diastereoseleetivity. It is an,elegant strategy for the quick construction of tricyclic architectures with four contiguous stereogenic centers in a single step. These tricyclic frameworks are the integral part of numerous natural products.
Synthesis and Photochromic Properties of Cycloalkylidene Fulgides
作者:Teck-Peng Loh、Wei-Woon Wayne Lee、Leong-Ming Gan
DOI:10.1055/s-2005-917082
日期:——
A series of cycloalkylidene fulgides have been synthesized using β,γ-unsaturated diesters, instead of the usual α,β-unsaturated diesters. A study of their photochromic properties revealed that an increase in the cycloalkylidene ring size caused a subsequent decrease in the formation of the closed form from the open form.
Yassin; Ahmed, Gamal A.; Mostafa, Journal of the Indian Chemical Society, 1996, vol. 73, # 11, p. 620 - 622
作者:Yassin、Ahmed, Gamal A.、Mostafa
DOI:——
日期:——
Regaila, Hassan A. A.; Gohar, Abd El-Kerim M. N.; El-Khrisy, Ezz El-Din A. M., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1982, vol. <B> 21, # 7, p. 658 - 661
作者:Regaila, Hassan A. A.、Gohar, Abd El-Kerim M. N.、El-Khrisy, Ezz El-Din A. M.、Helgemeie, Galal El-Din
DOI:——
日期:——
Gohar, Abd El-Kerim M. N.; Regaila, Hassan A. A.; El-Gemeie, Galal El-Din H., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1982, vol. 21, # 4, p. 368 - 370
作者:Gohar, Abd El-Kerim M. N.、Regaila, Hassan A. A.、El-Gemeie, Galal El-Din H.
DOI:——
日期:——
REGAILA H. A. A., EGYPT. J. CHEM., 1976(1978), 19, NO 5, 827-833