125187-47-5Relevant articles and documents
Strain-Release-Driven Friedel–Crafts Spirocyclization of Azabicyclo[1.1.0]butanes
Aggarwal, Varinder K.,Noble, Adam,Tyler, Jasper L.
supporting information, (2021/12/08)
The identification of spiro N-heterocycles as scaffolds that display structural novelty, three-dimensionality, beneficial physicochemical properties, and enable the controlled spatial disposition of substituents has led to a surge of interest in utilizing these compounds in drug discovery programs. Herein, we report the strain-release-driven Friedel–Crafts spirocyclization of azabicyclo[1.1.0]butane-tethered (hetero)aryls for the synthesis of a unique library of azetidine spiro-tetralins. The reaction was discovered to proceed through an unexpected interrupted Friedel–Crafts mechanism, generating a highly complex azabicyclo[2.1.1]hexane scaffold. This dearomatized intermediate, formed exclusively as a single diastereomer, can be subsequently converted to the Friedel–Crafts product upon electrophilic activation of the tertiary amine, or trapped as a Diels–Alder adduct in one-pot. The rapid assembly of molecular complexity demonstrated in these reactions highlights the potential of the strain-release-driven spirocyclization strategy to be utilized in the synthesis of medicinally relevant scaffolds.
Selective formation of six-membered oxa- and carbocycles by the In(III)-activated ring closure of acetylenic substrates
Qiu, Wen-Wei,Surendra, Karavadhi,Yin, Liang,Corey
supporting information; experimental part, p. 5893 - 5895 (2011/12/16)
Fifteen examples are disclosed of efficient In(III)-catalyzed six-membered ring closure leading to bi-, tri-, and tetracyclic products.
Synthesis and pharmacology of the isomeric methylheptyl-Δ8-tetrahydrocannabinols
Huffman, John W.,Liddle, John,Duncan Jr., Sammy G.,Yu, Shu,Martin, Billy R.,Wiley, Jenny L.
, p. 2383 - 2396 (2007/10/03)
The synthesis of the 3-heptyl, and the eleven isomeric 3-methylheptyl-Δ8-tetrahydrocannabinols (3-7, R and S methyl epimers, and 8) has been carried out. The synthetic approach entailed the synthesis of substituted resorcinols, which were subjected to acid catalyzed condensation with trans-para-menthadienol to provide the Δ8-THC analogue. The 1'-, 2'- and 3'-methylheptyl analogues (3-5) are considerably more potent than Δ8-THC. The 4'-, 5'- and 6'-methylheptyl isomers (6-8) are approximately equal in potency to Δ8-THC. Copyright (C) 1998 Elsevier Science Ltd.