Regiochemical control of the ring-opening of 1,2-epoxides by means of chelating processes. 2. Synthesis and reactions of the cis- and trans-oxides of 4-[(benzyloxy)methyl]cyclohexene, 3-cyclohexenemethanol, and methyl 3-cyclohexenecarboxylate
摘要:
The synthesis of the diastereoisomeric epoxides cis-1b-d and trans-2b-d and the products of their ring-opening by various nucleophiles are described. The results of the ring-openings of the trans-epoxides 2b-d can be rationalized by combining stereoelectronic and conformational arguments. However, the regioselectivity of the ring-openings of the cis-epoxides 1b-d can, in principle, be influenced by the chelation of a metal ion by the oxygen atom of the epoxy group and that of the substituent on the 4-position. The results of the reactions of the cis-epoxides 1b-d indicate that, to some degree, chelation is indeed a factor. How important a factor it is is dependent both on the reaction conditions and on the concentration and nature of the metal ion. In the ring-openings of the cis-epoxides 1b and 1d, chelation seems to be a larger factor than it is in the ring-openings of cis-epoxide 1c. However, in no case is chelation as large a factor as it was in the ring-openings of the cis-epoxide 1a, which was studied earlier. On the other hand, the autocatalyzed methanolysis, under neutral conditions, of epoxy acid 1e, followed by CH2N2 methylation of the crude product, afforded a mixture of the two regioisomeric hydroxy ethers in which the C-2-type compound predominates. This result suggests that intramolecular hydrogen bonding may determine the reactive conformation of 1e.
The invention relates a compound represented by the formula (1):
Q
1
-Q
2
-C(═O)—N(R
1
)-Q
3
-N(R
2
)-T
1
-Q
4
(1)
wherein R
1
and R
2
represent H or the like; Q
1
represents an aromatic ring, heterocyclic ring or the like; Q
2
represents a single bond, aromatic ring, heterocyclic ring or the like; Q
3
represents a group
or the like, Q
4
represents an aromatic ring, heterocyclic ring or the like; and T
1
represents —CO— or —SO
2
—, and a medicine which comprises the compound and is useful for thrombosis and embolism.
The invention relates a compound represented by the formula (1):
Q
1
-Q
2
-C(═O)—N(R
1
)-Q
3
-N(R
2
)-T
1
-Q
4
(
1
)
wherein R
1
and R
2
represent H or the like; Q
1
represents an aromatic ring, heterocyclic ring or the like; Q
2
represents a single bond, aromatic ring, heterocyclic ring or the like; Q
3
represents a group
1
or the like, Q
4
represents an aromatic ring, heterocyclic ring or the like; and T
1
represents —CO— or —SO
2
—, and a medicine which comprises the compound and is useful for thrombosis and embolism.
Synthesis, in vitro acetylcholine-storage-blocking activities, and biological properties of derivatives and analogs of trans-2-(4-phenylpiperidino)cyclohexanol (vesamicol)
作者:Gary A. Rogers、Stanley M. Parsons、D. C. Anderson、Lena M. Nilsson、Ben A. Bahr、Wayne D. Kornreich、Rose Kaufman、Robert S. Jacobs、Bernard Kirtman
DOI:10.1021/jm00126a013
日期:1989.6
Eighty-four analogues and derivatives of the acetylcholine-storage-blocking drug trans-2-(4-phenylpiperidino)-cyclohexanol (vesamicol) were synthesized, and their potencies were evaluated with the acetylcholine active-transport assay utilizing purified synaptic vesicles from Torpedo electric organ. The parent drug exhibits enantioselectivity, with (-)-vesamicol being 25-fold more potent than (+)-vesamicol. The atomic structure and absolute configuration of (+)-vesamicol were determined by X-ray crystallography. The absolute configuration of (-)-vesamicol is 1R,2R. Structure-activity evidence indicates that (-)-vesamicol does not act as an acetylcholine analogue. Alterations to all three rings can have large effects on potency. Unexpectedly, analogues locking the alcohol and ammonium groups trans-diequatorial or trans-diaxial both exhibit good potency. A potent benzovesamicol family has been discovered that is suitable for facile elaboration of the sort useful in affinity labeling and affinity chromatography applications. A good correlation was found between potencies as assessed by the acetylcholine transport assay and LD50 values in mouse.