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Volumn 81, Issue 7, 2008, Pages 863-868

Synthesis and absolute structure of (-)-umtatin

Author keywords

[No Author keywords available]

Indexed keywords

ABSOLUTE STRUCTURES; DE PROTECTIONS; DIETHYLAMINE;

EID: 58149267906     PISSN: 00092673     EISSN: 13480634     Source Type: Journal    
DOI: 10.1246/bcsj.81.863     Document Type: Article
Times cited : (5)

References (17)
  • 13
    • 58149224859 scopus 로고    scopus 로고
    • The steric repulsion effects in Nakatani's cyclization were also observed in the cyclizations of two phenyl butynones. As shown in scheme, the cyclization of 1-[2-(i-butyldimethylsiloxy)-5-methoxyphenyl]butynone 12a showed the six-membered cyclization to give the corresponding chromone 13, while the cyclization of 1-[2-(t-butyldimethylsiloxy)-6- methoxyphenyl]butynone 12b showed the five-membered cyclization to give the corresponding 3(2H)-furanone 14.
    • The steric repulsion effects in Nakatani's cyclization were also observed in the cyclizations of two phenyl butynones. As shown in scheme, the cyclization of 1-[2-(i-butyldimethylsiloxy)-5-methoxyphenyl]butynone 12a showed the six-membered cyclization to give the corresponding chromone 13, while the cyclization of 1-[2-(t-butyldimethylsiloxy)-6- methoxyphenyl]butynone 12b showed the five-membered cyclization to give the corresponding 3(2H)-furanone 14.
  • 17
    • 58149245564 scopus 로고    scopus 로고
    • Use of excess Lewis acids, magnesium iodide etherate or aluminium tribromide, caused partial racemization due to a dihydrofuran-ring opening and a following re-cyclization
    • Use of excess Lewis acids, magnesium iodide etherate or aluminium tribromide, caused partial racemization due to a dihydrofuran-ring opening and a following re-cyclization.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.