(+/-)-Homosarkomycin (2) and (+/-)-rosaprostol (3) were synthesized from (+/-)-methyl 2-oxo-bicyclo-[3.1.0]hexane-1-carboxylate (1) by using the nucleophilic ring opening reaction on the double-activated cyclopropane ring as the key step.
[EN] SMALL MOLECULE INHIBITORS OF KRAS G12D MUTANT<br/>[FR] INHIBITEURS À PETITES MOLÉCULES DE MUTANT DE KRAS G12D
申请人:MERCK SHARP & DOHME
公开号:WO2022221739A1
公开(公告)日:2022-10-20
Compounds or their pharmaceutically acceptable salts can inhibit the G12D mutant of Kirsten rat sarcoma (KRAS) protein and are expected to have utility as therapeutic agents, for example, for treating cancer. The disclosure also provides pharmaceutical compositions which comprise compounds disclosed herein or pharmaceutically acceptable salts thereof. The disclosure also relates to methods for use of the compounds or their pharmaceutically acceptable salts in the therapy and prophylaxis of cancer and for preparing pharmaceuticals for this purpose.
Two efficient and practical synthetic methodologies for the construction of small ring systems have been developed. The first method involves a novel rearrangement of cyclobutanes 10 and 14 leading to cyclopropanes 11 and 15 employing BF3.OEt(2) or POCl3 in the presence of pyridine or Raney nickel. The second method utilizes a novel cascade reaction of alpha,beta-unsaturated esters 25 and 36 possessing a cyclopropyl ketone moiety with TMSI in the presence of(TMS)(2)NH to afford polycyclic cyclobutane derivatives 26 and 38. A synthesis of(+/-)-anthoplalone (41) and a formal synthesis of (+/-)-lepidozene (42) were achieved utilizing 15, obtained by the above method.
Intramolecular Reactivity of Triplet Carbonylcarbenes
Through a double cyclization triplet carbonylcarbenes add smoothly to double bonds in the δ and ε position, but do not react intramolecularly with C-H bonds (see scheme). The addition reaction fails if the keto group is replaced with an ester group.
The reaction of bicyclo[3.1.0]hexane 1, possessing a doubly activatedcyclopropanering, with acetic acid and potassium acetate in DMSO proceeded smoothly to give the adduct 2 in good yield. A formal total synthesis of the potent anti-HIV agent (+/-)-carbovir (9) was done by converting 2 into a known precursor 8 in 8 steps via allyl alcohol 7 including the regioselective introduction of a double bond