Skip to main content
. Author manuscript; available in PMC: 2022 May 19.
Published in final edited form as: J Am Chem Soc. 2021 May 6;143(19):7471–7479. doi: 10.1021/jacs.1c02004

Figure 2.

Figure 2.

Four stereoisomeric transition states of the hetero-Diels–Alder reaction, with activation energies shown in kcal/mol. TS1(exo) and TS2(endo) correspond to observed products 7a and 7b, respectively. R = TBS in experimental work. R = TMS in calculated structures.