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A concise synthesis of some new classes of heterocycles (4-aryl-11-oxo-1,2,3,11-tetrahydro-1,3a-diaza-cyclopenta( a )anthracen-6-carbonitriles and 5-aryl-12-oxo-1,3,4,12-tetrahydro-2 H -1,4a-diazabenzo( a )anthracene-7-carbonitriles) has been developed by the ring transformation of suitably...
Rapid access to the ABCE ring system of the C-20 diterpene alkaloids was achieved by silver (I) promoted intramolecular Friedel–Crafts arylation of a functional group specific 5-bromo-3-azabicyclo(3.3.1)nonane derivative.
All eight geometric isomers of methyl 2,4,6-decatrienoate were synthesized from readily accessible starting materials by fully exploiting Wittig-type olefinations, and taking advantage of an easy separation of 2 E and 2 Z unsaturated esters. The aggregation pheromone of the brown-winged green...
4-Thia-5α- and 4-thia-5β-androstan-17-ones ( 1a and 1b ) were synthesized in order to obtain the NMR shielding parameters for the thioether C–S bond. The complete NMR assignment of both the proton and carbon atoms for these compounds and substituent-induced shifts (SIS) from the corresponding...
(−)-β-Caryophyllene has been converted into three stereoisomers of a new bicyclic compound that is structurally related to the known macrocyclic diterpene, flexibilene, in the same way β-caryophyllene is related to humulene. Key steps are selective cleavage of caryophyllene, addition of a...
In the current studies, we used the single-crystal X-ray analysis and Kakisawa–Kashman modification of the Mosher NMR method to determine the complete relative and absolute stereochemistries of the (+)-macrosphelides A (+)- 1 and B (+)- 2 . The stereostructure of (+)- 2 was determined by...
Specific 3-azabicyclo(3.3.1)nonane derivatives undergo skeletal cleavage when subjected to light or Lewis acidic conditions affording novel heterotricycles, which is in stark contrast to 3-oxabicyclo(3.3.1)nonanes.
The synthesis, structure and ring-closing metathesis (RCM) reactions of polyether bridged biscalix(4)arenes 6 in the partial cone conformation with upper rim allyl substituents are reported. The RCM reaction modes depend on the length of polyether chain. Diethylene glycolic chain produced the...
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