Enantioselective Acylations Catalyzed by Chiral Phosphines.
摘要:
Treatment of 10-dehydro-10-deacetylbaccatin III (2a) with trichloroacetic acid gave the bis-abeotaxane 3, whereas treatment of 2a and its 7-epimer (2b) with bases (DBU, NaH) triggered a tandem retroaldol-Michael reaction, giving a compound of the 7,8-seco-8,12-cyclotaxane type. Both skeletal rearrangements were accompanied by extensive reorganisation of the oxygen functions in the southern hemisphere of the molecule.
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关键词:
liquid crystalline thiophene compounds liquid crystalline polysiloxanes bithiophene derivatives liquid crystalline side chain polymers
DOI:
10.1021/jo951661v
被引量:
年份:
1996
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