Synthesis and anticonvulsant and sedative-hypnotic activity of 4-(alkylimino)-2,3-dihydro-4H-1-benzopyrans and benzothiopyrans
摘要:
A series of 4-(alkylimino)-5-hydroxy-7-alkyl-2,3-dihydro-4H-1-benzopyrans and -thiopyrans were synthesized and evaluated for anticonvulsant activity. Preliminary screening of these compounds revealed that 2,2-dimethyl-4-[(2-hydroxyalkyl)imino]-5-hydroxy-7-pentyl-2,3- dihydro-4H-1-benzopyrans 19 and 29, the 7-butyl analogue 34, and the corresponding 7-pentyl-4H-1-benzothiopyrans 38 and 39 had the most promising anticonvulsant activity. Synthesis of both enantiomers of 29 and 39 indicated that the R isomers 30 and 40 were the most active and showed very good protection against MES, pentylenetetrazole, and mercaptopropionic acid induced seizures after oral administration in mice. In the Irwin test these compounds showed a generalized depressant activity but at dosages higher than those showing anticonvulsant activity, whereas acute toxicity after oral administration was low (LD50 higher than 400 mg/kg).
作者:Angie Garcia、Dan Borchardt、Chia-En A. Chang、Michael J. Marsella
DOI:10.1021/ja907062v
日期:2009.11.25
Thermal isomerization of CBC(an) to THC(an) [nonaromatic analogues of plant cannabinoids cannabichromene (CBC) and Delta(1)-tetrahydrocannabinol (THC), respectively] is predicted in silico and demonstrated experimentally. Density functional theory calculations support a similar isomerization mechanism for the corresponding plant cannabinoids. Docking studies suggest that THC(an), although nonaromatic
Synthesis of chiloglottones – semiochemicals from sexually deceptive orchids and their pollinators
作者:Jacqueline Poldy、Rod Peakall、Russell Allan Barrow
DOI:10.1039/b912233h
日期:——
a 3-alkyl resorcinol derivative (3) precedes alkylation was applied in the synthesis of chiloglottone 1 (1dc), in 58% overall yield. Chiloglottone 1 is a member of a new class of natural products, representing a known sex pheromone of the thynnine wasp Neozeleboria cryptoides and pollinator attractant in the Australian sexually deceptive orchid genus Chiloglottis. The synthetic homologues were assessed
Unifying Metal- and Organocatalysis for Asymmetric Oxidative Iminium Activation: A Relay Catalytic System Enabling the Combined Allylic Oxidation of Alcohols and Prolinol Ether Catalyzed Iminium Reactions
作者:Magnus Rueping、Henrik Sundén、Erli Sugiono
DOI:10.1002/chem.201102551
日期:2012.3.19
A multicatalytic system consisting of tetrapropylammonium perruthenate/N‐methylmorpholine N‐oxide (TPAP/NMO) as oxidant, and diarylprolinol TMS‐ether as chiral amine catalyst, has been developed and applied in the efficient construction of valuable chiral molecules. The one‐pot domino reactions elaborated in the present study are based on the in situ generation of α,β‐unsaturated aldehydes from allylic
High-Yielding Total Synthesis of Sexually Deceptive Chiloglottones and Antimicrobial Dialkylresorcinols through an Organocatalytic Reductive Coupling Reaction
作者:Rudrakshula Madhavachary、Dhevalapally B. Ramachary
DOI:10.1002/ejoc.201403128
日期:2014.11
Biologically important, less-explored natural products of sexuallydeceptivechiloglottones, antimicrobialdialkylresorcinols, and their many analogues were synthesized in very good yields in a sequential two-pot manner by using an “organocatalyticreductivecouplingreaction” as the key step.
Enantio- and Diastereoselective Access to Distant Stereocenters Embedded within Tetrahydroxanthenes: Utilizing<i>ortho</i>-Quinone Methides as Reactive Intermediates in Asymmetric Brønsted Acid Catalysis
作者:Chien-Chi Hsiao、Hsuan-Hung Liao、Magnus Rueping
DOI:10.1002/anie.201406587
日期:2014.11.24
tetrahydroxanthenones by means of asymmetricBrønstedacidcatalysis has been developed. A chiral binol‐based N‐triflyphosphoramide was found to promote the in situ generation of ortho‐quinone methides and their subsequent reaction with 1,3‐cyclohexanedione to provide the desired products with excellent enantioselectivities. In addition, a highly enantio‐ and diastereoselectiveBrønstedacid catalyzed desymmetrization